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FAIR VALUE MEASUREMENTS (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Included in cash and cash equivalents
Amortized Cost	$ 7,307	$ 10,285
Estimated Fair Value	7,307	10,285
Restricted cash
Amortized Cost	795	795
Estimated Fair Value	795	795
Marketable securities
Amortized Cost	137,332	52,248
Gross Unrealized Gains	17	5
Gross Unrealized Losses	(37)	(19)
Estimated Fair Value	137,312	52,234
Money market funds
Included in cash and cash equivalents
Amortized Cost	5,807	8,079
Estimated Fair Value	5,807	8,079
Commercial paper
Included in cash and cash equivalents
Amortized Cost	1,500
Estimated Fair Value	1,500
Corporate notes
Included in cash and cash equivalents
Amortized Cost		2,206
Estimated Fair Value		2,206
Certificates of deposit
Restricted cash
Amortized Cost	795	795
Estimated Fair Value	795	795
Government-sponsored enterprise securities (due in less than 1 year)
Marketable securities
Amortized Cost	4,192	7,369
Gross Unrealized Gains		1
Gross Unrealized Losses		(1)
Estimated Fair Value	4,192	7,369
Government-sponsored enterprise securities (due in 1 to 2 years)
Marketable securities
Amortized Cost	401
Estimated Fair Value	401
Commercial paper (due in less than 1 year)
Marketable securities
Amortized Cost	12,486	5,496
Gross Unrealized Gains	12	3
Estimated Fair Value	12,498	5,499
Corporate notes (due in less than 1 year)
Marketable securities
Amortized Cost	114,157	39,383
Gross Unrealized Gains	5	1
Gross Unrealized Losses	(36)	(18)
Estimated Fair Value	114,126	39,366
Corporate notes (due in 1 to 2 years)
Marketable securities
Amortized Cost	6,096
Gross Unrealized Losses	(1)
Estimated Fair Value	$ 6,095

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Amount of gross unrealized gains from available-for-sale securities as of the reporting date.

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Amount of gross unrealized losses from available-for-sale securities as of the reporting date.

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

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This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Amount of short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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The aggregate value of all restricted investments.

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